Tecnura

16-29

Authors: Diego Armando Giral Ramírez, Javier Andres Muñoz Romero, Carlos Alberto Ramírez Vanegas

Objective: This article presents one of the Blockchain applications in power systems employing the electrical variables monitoring delivered by a simulated relay. Methodology: The electrical variables are verified, compared, and uploaded to a blockchain network created by a network of servers; these are responsible for uploading, validating, and exporting information to the system. This study is carried out through the Python programming language. Results: An algorithm capable of integrating these variables from a simulated relay is created, 4 servers are created that are in charge of taking the relay signals every minute, validating that they are unique in the blockchain and uploading them, the first node that completes this task uploads its identification and the information of the relay, the processing times of the information once obtained are approximately 10 seconds Conclusions: It is concluded that the algorithm is capable of decentralizing the information collected by the servers in times equal to or greater than one minute, which can be very useful when saving information, in applications such as control by the network operator it falls short by having times greater than or equal to one minute, it should be taken into account that, for the development of a blockchain with a greater number of equipment, it is advisable to use machines with high levels of processing, much higher RAM memories, these characteristics allow the algorithm to run smoothly and in the shortest possible time. Financing: Universidad Distrital Francisco José de Caldas

43 - 58

Authors: Camilo Torres Parra, Yelinca Saldeño Madero, Juan José Castiblanco Prieto, Noé Villegas Flores, Isidoro Fasolino

Context: The COVID-19 is the most recent global health concern that affects human health mainly the respiratory system with more than 170 million people affected by the virus worldwide. Also, Latin America has been emerging as an epicenter of contagion, and transmission is gradually increasing among the communities in each of the countries analyzed. The infection of more than 30 million people in Latin America supposes the construction of new models and habits of public health that promote attitudes to reduce the number of cases and mortality. Method: A proposal was defined based on three frameworks and models—the principle of healthy housing promoted by the Panamerican Health Organization, the four types of knowledge transfer without memorization proposed by the OECD, and the theory of social constructivism (in which knowledge is built from a present reality). This proposal is aims to help a community to understand the health risks present at home so that they can prevent the spread of the virus COVID-19 through the use of good practices. Results: The proposal shows categorized risk factors at home that increase the possibility of contagion of COVID- 19 and getting infected; also, it presents possible solutions to these factores, which focus on good practices of healthy housing to improve habitability and prevent diseases that also allow the virus to spread. Conclusions: It is necessary to implement strategies that humanize public health problems and that in turn include the knowledge that the field of engineering can contribute to solve these problems. In addition, these strategies must emerge from practical work focused on the community. An example of this is the proposal for good practices for healthy housing to prevent the spread of the COVID-19 virus.

80-95

Authors: Pablo Alejandro Perdomo Fernández, Carlos Alberto Gaviria López

Objective: In the design of a robotic hand prosthesis, a variety of problems arise for which there are multiple solutions proposed in the literature. One of them is the selection of a strategy for the automatic control of the movement of the hand. Within the functionalities of a prosthesis, the power grip functionality is one of the most important. Given the wide variety of proposals in terms of control techniques for power grip, the designer is faced with the dilemma of which of them is the most suitable for his particular design. Although there are metrics to quantify the quality of the grip, those that have been proposed address various aspects independently, which does not allow making a decision about the best option for the particular case. In this work, a method is proposed to calculate a composite indicator that allows the evaluation of the performance of control techniques in the power grip based on the following individual metrics that evaluate different aspects in the execution of the power grip: finger strength, grip strength, grip efficiency, grip cycle time, slip resistance, following error, and transient response overshoot. Thanks to the method proposed in this work, the question is answered: of several control options to be tested, which one offers better functional performance? Methodology: A set of metrics are adopted with which to obtain quantitative data related to the quality of the power grip and to the performance of the control target to govern the prosthesis; subsequently, selected individual metrics are calculated for each of the grip control techniques to be evaluated on a virtual environment, consisting of a robotic hand and an object to be grasped; then two composite indicators are constructed to obtain a quantitative assessment of the quality of the grip based on a statistical analysis, and the results are contrasted against the individual metrics used. Results: A method is proposed for the construction of a composite indicator, which allows the evaluation of the performance of control techniques, in power grips in robotic hands. By implementing this method, the best performance values were found in hybrid controllers. Conclusions: In this work, a method has been proposed to facilitate the decision-making of the designer regarding the most adequate control technique, among several available, to achieve the power grip with a specific prosthesis. The method seeks to build a composite indicator that groups together various metrics to evaluate particular grip functionality, and also to quantify the achievement of following instructions, facilitating decision-making about the incidence of the control technique in the achievement of the final objective.

111 - 123

Authors: Omar Ivan Trejos Buriticá, Luis Eduardo Muñoz Guerrero

Objective: To analyze and establish if there is a relationship between the aesthetic distribution of elements on the board and its impact on the learning of computer programming. Methodology: This study was conducted in parallel between two groups per semester from 2015 to 2018. The aesthetic elements referred to in this research were applied in one of the groups, and these elements were removed in the other one. The research is qualitative, with a final quantitative component. Results: The results show a direct relationship between the learning of computer programming by students and the aesthetic disposition mentioned in this article. Conclusions: It is concluded that knowledge is more understandable and meaningful for the student when it is aesthetically distributed with the resources of the classroom, which facilitates storing knowledge in the long-term memory. Funding: Universidad Tecnológica de Pereira